Those of you who bowl exclusively on synthetics might be surprised at how few games it takes to develop a track on wood lanes with dry outsides and dry backends. I have balls with under 30 games that look like that ball.
15 is probably a bit low, though.
Speaking of tracks, that looks almost like a spinner track, about 3" from both the middle finger and thumbhole. Weird...
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seadrive
Cogito ergo bowl